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Microchip Technology SST25WF020A-40I/SN
- Part No.:
- SST25WF020A-40I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25WF020A-40I/SN.pdf
- Description:
- IC FLASH 2MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:762
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Product details
Overview
SST25WF020A-40I/SN from Microchip Technology is a 2 Mbit (256 KByte), 1.8V SPI Serial Flash memory IC with single-supply operation (1.65–1.95 V), 40 MHz high-speed read capability, and industrial temperature range (−40°C to +85°C). It features uniform 4 KByte sectors and 64 KByte overlay blocks, 256-byte page programming, and hardware/software write protection - deployed in embedded firmware storage, boot code retention, and IoT sensor node configuration.
For engineers reviewing the SST25WF020A-40I/SN datasheet, SST25WF020A-40I/SN pinout, SST25WF020A-40I/SN application, or SST25WF020A-40I/SN equivalent, key selection criteria include SPI Mode 0/3 compatibility, ultra-low 4 µA power-down current, 100,000-program/erase endurance, 20+ year data retention, and SOIC-8 (150 mil) package suitability for space-constrained industrial PCBs.
Technical Context
The SST25WF020A-40I/SN implements a four-wire SPI interface (SCK, SI, SO, CE#) with dual-mode support (Mode 0 and Mode 3), enabling interoperability with diverse host controllers without protocol translation. Its SuperFlash technology uses split-gate cells and thick-oxide tunneling to achieve faster erase times (40 ms sector, 80 ms block, 300 ms chip) and lower energy per operation versus conventional NOR flash.
Hardware control pins HOLD# and WP# provide real-time serial transaction suspension and nonvolatile block-protection lock-down (via BPL bit), while the status register exposes BUSY, WEL, and BP0/BP1/TB bits for precise software-managed memory access control and end-of-write polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256 KByte) - supports full bootloader images or multi-firmware partitioning in resource-limited microcontrollers. |
| Supply Voltage | 1.65–1.95 V - enables direct integration with 1.8 V I/O domains without level-shifting circuitry. |
| Max Clock Frequency | 40 MHz - delivers up to 4.8 MB/s effective read throughput using High-Speed Read (0BH) instruction with dummy cycle. |
| Endurance | 100,000 program/erase cycles - ensures reliable field updates over 10+ years in firmware-over-the-air (FOTA) applications. |
| Data Retention | >20 years at +85°C - guarantees long-term integrity of calibration data and device identity in industrial environments. |
| Erase Granularity | Uniform 4 KByte sectors and 64 KByte overlay blocks - allows fine-grained firmware patching without disturbing adjacent application code. |
| Page Size | 256 bytes - aligns with common MCU cache line sizes and simplifies buffer management in embedded drivers. |
Pinout & Package
Package: 8-lead SOIC (150 mil), RoHS-compliant, surface-mountable with standard reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low selection signal; must remain low throughout command sequence; drives device into Standby mode when high. |
| SO | Serial Data Output | Tri-state output; shifts data on falling edge of SCK; enters high-impedance state during HOLD# or standby. |
| WP# | Write Protect | Enables/disables BPL bit lock-down; when low, prevents modification of BP0/BP1/TB unless BPL = 0. |
| VSS | Ground | Reference return path for all digital and analog functions; requires low-inductance connection to PCB ground plane. |
| VDD | Power Supply | 1.65–1.95 V supply input; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin. |
| HOLD# | Hold | Pauses ongoing SPI transfer without deselecting device; valid only when CE# is low and SCK is low during edge transition. |
| SCK | Serial Clock | Input timing reference; rising edge latches SI, falling edge clocks SO; supports Mode 0 (idle low) and Mode 3 (idle high). |
| SI | Serial Data Input | Command/address/data input; sampled on rising edge of SCK; must meet setup/hold timing relative to SCK. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell architecture reduces program/erase voltage stress, enabling 1.8 V-only operation and extending reliability beyond 100k cycles. |
| Flexible Erase Architecture | Independent 4 KByte sector and 64 KByte block erase permits partial firmware updates without full chip reprogramming. |
| Ultra-Low Power Modes | 4 µA deep power-down current minimizes battery drain in always-on sensor nodes; 10 µA standby enables rapid wake-up. |
| Hardware Write Protection | WP# pin combined with BPL bit allows irreversible lockdown of memory protection settings after factory programming. |
| End-of-Write Detection | BUSY bit polling eliminates need for fixed delay timers, enabling deterministic firmware update routines across varying temperature conditions. |
Applications
| Industrial PLC Firmware Storage | Medical Device Calibration Data |
|---|---|
|
Use Scenario: Storing firmware images and parameter tables in programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing fast 40 MHz read access for cold-start execution and secure field-upgrade capability via sector erase. Use Value: 20+ year data retention ensures calibration and safety-critical firmware remain intact across extended product lifecycles without maintenance. |
Use Scenario: Retaining patient-specific calibration coefficients and regulatory audit logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure configuration memory with hardware WP# and software BP bits preventing accidental overwrite during runtime. Use Value: 100,000-cycle endurance supports frequent recalibration events over device lifetime without flash wear-out risk. |
| Smart Meter Bootloader | Automotive Telematics OTA Storage |
|
Use Scenario: Hosting signed bootloader code in utility smart meters requiring remote firmware validation before execution. IC Role / Device Role / Timing Role: Trusted boot source with 4 KByte sector granularity enabling atomic firmware swap and rollback on signature failure. Use Value: Uniform 4 KByte erase blocks allow verified firmware partitions to be updated independently, minimizing downtime during upgrades. |
Use Scenario: Storing encrypted OTA firmware packages in vehicle telematics control units with limited board space. IC Role / Device Role / Timing Role: Compact SPI flash (SOIC-8) providing 2 Mbit storage for differential firmware patches and cryptographic keys. Use Value: 4 µA deep power-down current extends battery backup life during vehicle ignition-off periods without compromising update readiness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI serial flash applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q20EW | Same density (2 Mbit), 1.65–1.95 V, 104 MHz max clock, but uses Quad SPI (QPI) mode by default; requires different initialization sequence. | Higher bandwidth for streaming media; less suitable for legacy SPI-only hosts lacking QPI support. | Select W25Q20EW only if host MCU supports QPI or enhanced SPI modes and higher speed justifies firmware driver changes. |
| Cypress S25FL020L | 2 Mbit, 2.7–3.6 V supply, 80 MHz max clock; no 1.8 V operation; different status register layout and protection scheme. | Designed for 3.3 V systems; incompatible with 1.8 V I/O domains without level shifters. | Choose S25FL020L only in 3.3 V designs where higher voltage margin and faster erase (35 ms sector) outweigh supply incompatibility. |
Compared with Winbond W25Q20EW and Cypress S25FL020L, the SST25WF020A-40I/SN uniquely delivers 1.8 V native operation, ultra-low 4 µA deep power-down, and pin-compatible SOIC-8 footprint - making it optimal for battery-powered, space-constrained industrial and medical devices requiring long-term reliability at minimal system cost.
Availability
SST25WF020A-40I/SN is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device calibration data retention, and smart meter bootloader applications requiring stable component supply across multi-year production cycles.
Supply support for SST25WF020A-40I/SN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog components, and memory solutions, with emphasis on reliability, longevity, and embedded system integration.
The SST25WF020A-40I/SN belongs to Microchip's Serial Flash 25 Series, designed specifically for low-voltage, low-power embedded applications demanding robust nonvolatile storage with industrial-grade endurance and data retention.
FAQ
What is the maximum clock frequency supported by SST25WF020A-40I/SN during read operations?
The SST25WF020A-40I/SN supports up to 40 MHz during High-Speed Read operations (instruction 0BH), which includes one dummy byte after address transmission. Standard Read (03H) is rated to 25 MHz. Both modes operate within the same 1.65–1.95 V supply range and require proper signal integrity layout to maintain timing margins at maximum frequency.
Does SST25WF020A-40I/SN support SPI Mode 0 and Mode 3 simultaneously?
Yes, the SST25WF020A-40I/SN natively supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) without configuration. The device samples SI on the rising edge and drives SO on the falling edge of SCK in both modes; only the idle state of SCK differs - low in Mode 0, high in Mode 3 - ensuring seamless interoperability with diverse host controllers.
How does hardware write protection work on SST25WF020A-40I/SN?
Hardware write protection on SST25WF020A-40I/SN is implemented via the WP# pin, which enables or disables the Block-Protection Lock-Down (BPL) bit in the status register. When WP# is driven low, the BPL bit controls whether BP0/BP1/TB bits can be modified; setting BPL=1 permanently locks protection settings until next power cycle - a critical feature for securing factory-programmed firmware regions.
What is the erase time for a 4 KByte sector in SST25WF020A-40I/SN?
The typical sector-erase time for a 4 KByte sector in SST25WF020A-40I/SN is 40 ms, with no maximum specified in the datasheet. This value reflects internal self-timed operation; users must poll the BUSY bit in the status register or wait ≥40 ms before issuing subsequent commands. Sector erase is ignored if the target region is protected by BP bits or if WREN has not been executed.
Is SST25WF020A-40I/SN compatible with standard SOIC-8 footprints?
Yes, SST25WF020A-40I/SN uses an industry-standard 8-lead SOIC package (150 mil width), fully compatible with IPC-7351B SOIC_8_150MIL land pattern. Pin assignments match JEDEC MS-012AC, and thermal characteristics support standard reflow profiles - enabling drop-in replacement in existing designs without layout revision.
SST25WF020A-40I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 40 MHz
- Write Cycle Time - Word, Page:
- 3.5ms
- Access Time:
- -
- Voltage - Supply:
- 1.65V ~ 1.95V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SST25WF020A-40I/SN FAQ
1.How can I place an order for SST25WF020A-40I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF020A-40I/SN on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SST25WF020A-40I/SN reliable?
The price and inventory of SST25WF020A-40I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25WF020A-40I/SN is usually 5 days.
3.What payment methods are accepted for SST25WF020A-40I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF020A-40I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF020A-40I/SN?
SST25WF020A-40I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF020A-40I/SN order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SST25WF020A-40I/SN?
For technical support, including SST25WF020A-40I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25WF020A-40I/SN requirements.
6.How does Aetrix verify that SST25WF020A-40I/SN is sourced from the original manufacturer or authorized distributors?
All SST25WF020A-40I/SN products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SST25WF020A-40I/SN meets industry standards.
7.What is the process for return or replacement of SST25WF020A-40I/SN?
All SST25WF020A-40I/SN units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF020A-40I/SN, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SST25WF020A-40I/SN part is unused and in its original packaging.
Return procedure for SST25WF020A-40I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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